Question: What are the analytic function which start with the letter function
Paraphrase: What are the analytic function which begin with the letter function
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q215084 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'function')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Riemann zeta function, Riemann zeta function